No it's a 2-1/2" gun with 3 ton proof. The date code is definitely 1974. Nice because it is 51 years ago so C&R.
I mentioned the bore size stamps because not all have this. The 12 in the diamond normally determines the minimum bore. The bore dimension stamps look newer than the rest of the proofs. Since the bores are perfect but there are no re-proof marks, I am suspecting that the gun was freshened up in general and the bores cleaned up to .729 but the amount removed didn't trigger a reproof. Probably in England before it was imported to the states (there is a tiny import mark under the fore end on the lower rib.
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